1791991535568 has 160 divisors (see below), whose sum is σ = 5121320131200. Its totient is φ = 536357541888.

The previous prime is 1791991535567. The next prime is 1791991535591. The reversal of 1791991535568 is 8655351991971.

It is a super-2 number, since 2×1791991535568² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1791991535567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 186292263 + ... + 186301881.

It is an arithmetic number, because the mean of its divisors is an integer number (32008250820).

Almost surely, 2^{1791991535568} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1791991535568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2560660065600).

1791991535568 is an abundant number, since it is smaller than the sum of its proper divisors (3329328595632).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1791991535568 is a wasteful number, since it uses less digits than its factorization.

1791991535568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17749 (or 17743 counting only the distinct ones).

The product of its digits is 91854000, while the sum is 69.

The spelling of 1791991535568 in words is "one trillion, seven hundred ninety-one billion, nine hundred ninety-one million, five hundred thirty-five thousand, five hundred sixty-eight".